High Field Properties of Superconducting Nb_3Ge Films Prepared by Chemical Vapor Deposition

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概要

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• The superconducting critical current densities J_c of Nb_3Ge films prepared by chemical vapor deposition have been investigated in magnetic fields parallel and perpendicular to the film plane up to above 20 T. The J_c and its field dependence are strongly influenced by any change in the microstructure of films deposited at different deposition temperatures T_d. Films deposited at a low T_d of 800℃ exhibit a high J_c below 20 T and show a slight difference between parallel and perpendicular field dependences of J_c. As T_d is increased to 900℃, the J_c of films is appreciably lowered over the entire field range and the difference between two field dependences of J_c is remarkably enlarged. The upper critical field H_<c2> of these films has been obtained by extrapolating the Kramer plot of J^<1/2>_cH^<1/4> versus H to J^<1/2>_cH^<1/4>=0, and were estimated to range from 28 to 31 T at 4.2 K.

• 社団法人応用物理学会の論文
• 1987-06-20

著者

• WATANABE Kazuo

  Institute for Materials Research, Tohoku University

• Suzuki M

  Shizuoka Univ. Hamamatsu

• Kobayashi N

  Institute For Materials Research Tohoku University Katahira

• Watanabe Kazuto

  Safety Assessment Department Chugai Pharmaceutical Co. Ltd.

• Watanabe Yuji

  Department Of Nuclear Medicine Faculty Of Medicine Kyoto University

• Noto Koshichi

  The Research Institute For Iron Steel And Other Metals

• Watanabe Kazuo

  The Reesearch Institute Of Electronics Shizuoka University

• Suzuki Mitsumasa

  Department Of Electrical Engineering Faculty Of Engineering Tohoku University

• ANAYAMA Takeshi

  Department of Electric Engineering, Tohoku University

• Watanabe K

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Watanabe Yuji

  Department Of Molecular Neurobiology Institute Of Development Aging & Cancer Tohoku University

• Anayama T

  Hachinohe National Coll. Technology Hachinohe

• Anayama Takeshi

  Dept. Of Electrical Engineering Tohoku University

• Anayama Takeshi

  Department Of Electric Engineering Tohoku University

• Watanabe Yuji

  Department Of Electrical Engineering Faculty Of Engineering Tohoku University

• Watanabe Yuji

  Department Of Computational Science And Engineering Graduate School Of Engineering Nagoya University

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